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HDMI and USB at same time

Hi,
Saturday I had some time to open the HDMI dock (for Galaxy Tab 7) and mod it to have alternative power input.
After that I was able to use the HDMI output and USB host at same time. The setup is:
- HDMI out for Samsung TV
- wireless USB keyboard
- external HDD connected with a powered HUB
In this setup I was able to use the keyboard and video files from external HDD while watching on TV screen.
The only problem is that the "MTP Application" notification is still there and the tablet is not full powered from external power supply, it discharges slowly the battery.
After some investigation I've seen that on the original charger there seems to be some resistors between USB lines and Vusb and GND. If I connect the original charger (not inserted on power outlet) the tablet is full powered and the MTP Application is not displayed (when I put the tablet in dock). After that if I remove the cable and insert the USB host cable everything is OK and tablet is full powered with USB host and HDMI working.
The docking is powered with 5V/2A PDA DC adapter.
When I'll open the dock again I will make some picture.
Your are welcome for questions and suggestions.
Emil

HOW MUCH?
Cant believe this is my first post on any message board EVER but what better reason! First i would like to know how much would u charge to make the modification for me? I would provide the dock and any other materials that u need of course. Secondly, since the dock works with ALL tab variants(PERSONALLY ONLY TESTED WITH P1000, P7100, P6200, P6210 BUT 99% CERTAIN), u might want to post your development in every other versions forum. I believe this would generate a LOT more interest in this project because there actually has already been a few threads created in which several attempts were made but no one could find the magic combo(plus it could mean a few extra bucks in your billfold!). I waited to post in hopes that u would update with pictures and/or a tutorial but still would rather you perform the actual surgery. Congratulations on accomplishing what samsung should have done from the start...a TRUE multimedia dock! I guess the only suggestion i could offer is if it were possible to actually add a few usb ports into the base of the hdmi dock itself, which is how i feel samsung should have made it originally...definitely not a priority.
Here are a few reference threads if interested & i've already provided a link in each one pointing to your original post for those interested (hope u dont mind!)
http://forum.xda-developers.com/showthread.php?t=1610832
http://forum.xda-developers.com/showthread.php?t=1155065
http://forum.xda-developers.com/showthread.php?t=1149442

Sorry, but I can't do this for you.... It's complicated.
Now I work to found a solution to put an USB connector on the dock and to put a power connector to.
The big problem is that the tab enters on MTP mod when powered this way. As described on other threads there is a way with USB lines to activate full external power.
When I'll have a full modification dock I'll put some pictures and instruction for that.

waiting for pics and further info please...

Galaxy Tab Dock modified
Now I have a full functional dock, modified.
So, after receiving the Galaxy Tab Plus media dock from ebay I've found that I can change the tab fixing part with the one on the old Galaxy Tab Dock.
So, now I have old Galaxy Tab multimedia dock full compatible with my Galaxy Tab Plus.
Then I modified the dock to include standard power jack and standard miniusb connector for OTG.
The USB Host is powered from the external power supply, this helps to not discharge the battery when using tab and slow charging.
I made some pictures with details for connections and modification.
You can view at:
http://www.flickr.com/photos/buzdumil/sets/72157630734690786
There was some work to do...is not very easy. The best thing that can be done is to make a PCB. That PCB, at in my pictures, could be fixed near metal weight. Also there the clips of the case need to be cut, but there is no problem because at same position exist screws for fixing.
The problem with MTP application started when power connected or tab inserted on dock remains. But now is easier to use external HDD, usb keyboard & mouse and television to watch movies.

That's amazing, Emil! That's the dock accessory Samsung should have sold in the first place. After looking over your pictures, I'm ready to go order a soldering iron and get to work!

Hi emil b just letting you know i was playing around with my dock and found how to get rid of the red x from when power is applyd.
First connect power and get red x....
Then disconect the earth and re connect it again..
This forces AC Charge mode...
No resisters or shorting data lines are needed..
So good for being in host mode...
All you need to do is put a on/off switch inline on the earth
Where you supplied power to the dock.
Doesnt need to be inside the dock..
Give it a try and let me know...
Just have to play with it and hit switch a couple of times...

Im looking at all options concerning the modification of this dock. One question that comes to mind is: If I only use the red and blackwires to send power to the USB connector, will I still be able to use the OEM 30 power connector??

OP, I am going to attempt to make this modification myself. Would you be able to provide any additional instructions/suggestions to the pictures up on Flickr?
Thanks,
cypher

mr_esmit said:
Im looking at all options concerning the modification of this dock. One question that comes to mind is: If I only use the red and blackwires to send power to the USB connector, will I still be able to use the OEM 30 power connector??
Click to expand...
Click to collapse
No because the origonal charger has the resisters on the data lines...
you are better to add just power to pin 7(9) and earth to pin (1)30..
then add a otg dongle..

Data Issues (e.g. viewing Phone contents in Windows) - Please help/advise

I think I'm doing something wrong, the Pixel 2 only works with certain cables, or something else (port defect, OS defect, special drivers needed, etc.). I wanted to transfer some files from my PC (Windows 10) to my phone. I have a USB 2.0 to type-C cable that I plugged in. The phone came up in Windows but the contents of the window were blank. I could not access any contents or view anything on the phone. In Settings under USB I saw it said "charging" so I selected "transfer files" and it disconnected from Windows and reconnected only to go right back to charging. I have locked/unlocked, restarted the phone, tried different USB ports, and nothing works. The only function that works is "charging." When I use the supplied type-C to type-C that came with the phone I can get it to work only if I plug into the computer, then the phone, lock the phone, and then unlock it using my PIN (not fingerprint). I ordered a USB 3.0 to type-C cable to see if that works. Is there something I'm missing on why the phone won't connect with a USB-A to USB type-C cable...except to charge? Drivers or something else?
Also...I've reset the phone once (that didn't work either)...and even tried enabling USB debugging.
Please help. Thanks in advance.

Well...I think I figured it out with more troubleshooting. Apparently, you can't connect this phone to a computer via a USB hub. I was able to get it to work by plugging directly into my computer. I tried it on two different powered USB 3.0 hubs and it didn't work. Not sure why or if there is a way around it for convenience.

How to get non-storage USB peripherals to work?

I got an Anker OTG hub. It works completely if I connect it to my laptop, however, if I try connecting it to my phone, my USB mouse+keyboard combo (wireless with a receiver) doesn't work. It works with other devices, including my laptop's USB C port, and my old phone's USB C port.
I did turn OTG on prior to connecting anything (I'd love (root) to know to keep it on at all times).
I already ensured they work on other computers through that OTG adaptor, and that a USB storage stick works on this phone through it. In addition to that, HDMI works too (the adaptor also has an HDMI port), and the USB C passthrough passes power successfully, as well. No warp charging, but that is to be expected and that's alright.
I have TWRP and everything. Is there a kernel mod I need? I'd be happy to do whatever's needed.

Maybe OnePlus needs some updates
Even i have latency issus with my midi keyboard
But not with op5t

Connecting Pixel 3a to PC for file transfer.

I don't own any USB-C devices or cables at this time.
I am planning to buy Pixel 3a soon and would like to understand whether it comes with everything I need to connect it to my PC that is 6 years old and equipped with USB-3 Standard A connectors on motherboard. The objective is to transfer files in both directions.
From what I understand 3a comes with USB-C to USB-A adapter in the box. Does it mean I don't need anything extra to connect to PC to transfer files? That is it seems I would plug this adapter to motherboard, then USB-C cable to the adapter, then another end of USB-C cable to the phone. Is this correct?
And if I wanted one-cable solution then this is what I would want: https://www.amazon.com/dp/B01E9W8KY...colid=DAYIUPLW7ZM8&psc=1&ref_=lv_ov_lig_dp_it, right?

JoeSchmoe007 said:
I don't own any USB-C devices or cables at this time.
I am planning to buy Pixel 3a soon and would like to understand whether it comes with everything I need to connect it to my PC that is 6 years old and equipped with USB-3 Standard A connectors on motherboard. The objective is to transfer files in both directions.
From what I understand 3a comes with USB-C to USB-A adapter in the box. Does it mean I don't need anything extra to connect to PC to transfer files? That is it seems I would plug this adapter to motherboard, then USB-C cable to the adapter, then another end of USB-C cable to the phone. Is this correct?
And if I wanted one-cable solution then this is what I would want: https://www.amazon.com/dp/B01E9W8KY...colid=DAYIUPLW7ZM8&psc=1&ref_=lv_ov_lig_dp_it, right?
Click to expand...
Click to collapse
You would need to get a cable like the one in your link to connect to PC.
The adapter it comes with allows you to connect a USB thumb drive to the phone.

kc6wke said:
You would need to get a cable like the one in your link to connect to PC.
The adapter it comes with allows you to connect a USB thumb drive to the phone.
Click to expand...
Click to collapse
Got it, thanks.

kc6wke said:
You would need to get a cable like the one in your link to connect to PC.
The adapter it comes with allows you to connect a USB thumb drive to the phone.
Click to expand...
Click to collapse
I'm pretty sure you could also use it to connect a male to male USB A cable to connect a phone to a computer.
But yea, a USB-A to USB-C cable is the easier option.
Sent from my Google Pixel 3a XL using XDA Labs

If you need to plug it in to your computer yes, you need an additional cable. But for data transfer only just use ftp, no cable need and probably faster

Artim_96 said:
If you need to plug it in to your computer yes, you need an additional cable. But for data transfer only just use ftp, no cable need and probably faster
Click to expand...
Click to collapse
I find adb is far faster for data transfer when it wants to work tbh.
Sent from my Google Pixel 3a XL using XDA Labs

I just got a 3a and can't get the phone to connect to my PC properly for file transfer or adb use despite the phone showing properly on device manager and having had it work fine with an S9, G7 power and even a previous 3a. I'm lost.

carnivalrejectq said:
I just got a 3a and can't get the phone to connect to my PC properly for file transfer or adb use despite the phone showing properly on device manager and having had it work fine with an S9, G7 power and even a previous 3a. I'm lost.
Click to expand...
Click to collapse
I don't have the 3a but I saw in one of the videos there is a setting in the phone that defines what to do when phone is connected to a computer. One is "Charge Only", another something like "File Transfer" (and I think there are others). Could it be that you have it set it to "Charge Only"?

carnivalrejectq said:
I just got a 3a and can't get the phone to connect to my PC properly for file transfer or adb use despite the phone showing properly on device manager and having had it work fine with an S9, G7 power and even a previous 3a. I'm lost.
Click to expand...
Click to collapse
It's likely one of three things.....
1) You haven't installed the latest ADB drivers (although this is unlikely if you had it working with this computer and another Pixel 3a).
2) As already noted, by default you have to manually change the connection type to "Data Transfer" anytime you plug your phone into a computer. When you plug the phone into the computer, you should see a new "Android System" notification on your phone. Open that notification and change the connection type from "Charge Only" to "Data Transfer".
3) To use ADB, you need to make sure you have turned on Developer Settings and turned on "USB Debugging" in the developer settings.
If all of these things are correct, then I would "Revoke USB debugging authorizations" in the developer settings and then plug the phone back into the computer. You will see a new authorization popup on the phone which you need to accept.

Skittles9823 said:
I'm pretty sure you could also use it to connect a male to male USB A cable to connect a phone to a computer.
Click to expand...
Click to collapse
Not really. There's no such thing as a Type-A to Type-A USB cable in USB 2.0. You can probably find a cable with USB 2.0 connectors on both ends, but they violate the spec, and can't properly be called "USB." (there's lots of crap like that around) In USB 3.1, there's a very specialized one "defined for operating system debugging and other host-to-host connection applications."
The adapter included with Pixels is a USB "On-The-Go" one, it tells the phone act as a USB host (so it can connect to a thumb drive, keyboard, USB headset, etc.). Per the spec "This cable assembly is defined for direct connect to a USB device (e.g., a thumb drive). System functionality of using this adaptor assembly together with another USB cable assembly is not guaranteed." Having said that, Google does provide the adapter to allow the Pixel to connect to another Android phone using its A to micro-B "charging" cable in order to copy data when changing phones.
To have the phone appear as a drive on a PC, the PC is the host. You need a USB Type-A to Type-C cable to connect to the Pixel.

mike.s said:
Not really. There's no such thing as a Type-A to Type-A USB cable in USB 2.0. You can probably find a cable with USB 2.0 connectors on both ends, but they violate the spec, and can't properly be called "USB." (there's lots of crap like that around) In USB 3.1, there's a very specialized one "defined for operating system debugging and other host-to-host connection applications."
The adapter included with Pixels is a USB "On-The-Go" one, it tells the phone act as a USB host (so it can connect to a thumb drive, keyboard, USB headset, etc.). Per the spec "This cable assembly is defined for direct connect to a USB device (e.g., a thumb drive). System functionality of using this adaptor assembly together with another USB cable assembly is not guaranteed." Having said that, Google does provide the adapter to allow the Pixel to connect to another Android phone using its A to micro-B "charging" cable in order to copy data when changing phones.
To have the phone appear as a drive on a PC, the PC is the host. You need a USB Type-A to Type-C cable to connect to the Pixel.
Click to expand...
Click to collapse
Thanks for the info.
Sent from my Google Pixel 3a XL using XDA Labs

sic0048 said:
It's likely one of three things.....
1) You haven't installed the latest ADB drivers (although this is unlikely if you had it working with this computer and another Pixel 3a).
2) As already noted, by default you have to manually change the connection type to "Data Transfer" anytime you plug your phone into a computer. When you plug the phone into the computer, you should see a new "Android System" notification on your phone. Open that notification and change the connection type from "Charge Only" to "Data Transfer".
3) To use ADB, you need to make sure you have turned on Developer Settings and turned on "USB Debugging" in the developer settings.
If all of these things are correct, then I would "Revoke USB debugging authorizations" in the developer settings and then plug the phone back into the computer. You will see a new authorization popup on the phone which you need to accept.
Click to expand...
Click to collapse
Turns out there was a heavy Windows update pending upon restart. The thing bugs me about them constantly so I usually ignore them. I restarted and let it do it's thing for 4 hours (damn Windows lol) and after it restarted the phone for file transfer, as well as adb started working correctly.

B130DL (BLU View 2) automatically ejecting USB device

I have a custom designed & built USB hub board, where multiple such boards have been working with multiple android devices for multiple years. One thing I can always do with a new USB device is plug my board into the Android device, then plug a USB thumb drive into one of my boards hub inputs, and then from the Android device use Google Files to view the contents of the "disk" (the USB thumb drive). Note that most times I must first go to Settings, turn on Developer Options, and change the Default USB Configuration to allow File Transfer.
Now I'm trying it out with the very inexpensive B130DL. I've changed Default USB Configuration to allow File Transfer. I plug a USB thumb drive into my hub board in advance, and I plug my usb hub board into the B130DL in advance. Then I power up the usb hub board. SUCCESS... a moment later the BL130DL shows that USB trident icon at the top. From Google Files I'm able to view the contents of this disk. UH OH... a moment later I get a message that the usb device has been ejected. (I believe this message comes from Google Files. If I'm not currently running Google Files, I don't see this eject message. I just see the USB trident icon go away.)
Note that the B130DL is [disliking] my USB hub, specifically. If I plug in both B130DL and USB thumb drive, then it takes about 6.5 seconds from powering on the hub board to when the B130DL shows the USB trident icon. Then it takes another roughly 9 seconds for the USB trident icon to go away again. If I do the same test, plugging in the USB thumb drive 3 seconds after powering on the hub board, then the same things happen based on timing from powering on the hub board. Also, once ejected, removing and replacing the USB thumb drive doesn't repeat the test. I must remove and replace hub board power to repeat the test. In essence, it seems like the B130DL is ejecting the hub and thus everything on it. Meanwhile, a separate USB OTG cable works indefinitely when plugged into the B130DL. Note as well that this very same usb hub board works great and continuously when plugged into a different phone (Samsung A01, Android 11). I've been swapping between phones (B130DL and A01) repeatedly to make sure I haven't broken my hub board in any way. Also, In the past, this usb board has worked with Android 9 and 10. The B130DL is Android 10.
So what about the B130DL is it that causes it to first work with my usb hub board and then eject it? Any good ideas? Again, note that the problem is NOT intrinsically with my custom usb hub board, because that works great with many other Android devices. It's this specific B130DL that has the problem. True, it might be customized by BLU to refuse a number of USB OTG devices. Or it might be customized by BLUE to do something else. This is my question.
Thanks!